Weak antiferromagnetism and dimer order in quantum systems of coupled tetrahedra
Strongly Correlated Electrons
2016-08-31 v5
Abstract
We analyze the phases of an S=1/2 spin model on a lattice of coupled tetrahedra. The presence of both Heisenberg and antisymmetric, Dzyaloshinsky-Moriya interactions can lead to two types of symmetry-broken states: non-magnetic dimer order and, unexpectedly, exotic 4 sub-lattice weak antiferromagnetic order - a state with a generically small ordered moment and non-zero chirality. External magnetic field also induces weak antiferromagnetism co-existing with strong dimer correlations in the ground state. These states are formed as a result of broken Ising symmetries and exhibit a number of unusual properties.
Keywords
Cite
@article{arxiv.cond-mat/0404674,
title = {Weak antiferromagnetism and dimer order in quantum systems of coupled tetrahedra},
author = {Valeri N. Kotov and Michael E. Zhitomirsky and Maged Elhajal and Frederic Mila},
journal= {arXiv preprint arXiv:cond-mat/0404674},
year = {2016}
}
Comments
5 pages, 4 figures; final version to appear in Phys. Rev. B